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Bismuth Crystal

The crystals form floating in a super cooled bismuth melt.Actual growing time is about 5-10mins.The rapid growth is responsible for the hollow forms,which are also called "hopper" crystals.The iridescent metallic colours are caused by light scattering on the thin layer of bismuth melt and are in contact with the air.The brightness and colour intensity depend on the purity of the bismuth used,which has great influence on the quality of the crystals.Regular bismuth produces crystals with blue/purple colours.Includes free u.k postage and packing .